CEP II A L OCHOR DA. 7 



The vasculai- system of Amphioxus appears at about the same 

 time as the first visceral clefts. 



BIBLIOGRAPHY. 



(1) A. Kowalevsky. "Entwicklungsgeschichte des Amphioxus laiiceolatus." 

 Mem. Acad. Imper. deg Sciences de St Petersboitrg, Series vn. Tom. xi. 1867. 



(2) A. Kowalevsky. "Weitere Studien iiber die Entwicklungsgescbichte des 

 Amphioxus lanceolatus." Archiv f. mikr. Anat., Vol. xm. 1877. 



(3) Leuckart u. Pagenstecher. " Untersuchuugen iiber niedere Seethiere." 

 MiUler's Archiv, 1858. 



(4) Max Schultze. "Beobachtung junger Exemplare von Amphioxus." Zcit. 

 f. wiss. Zool., Bd. in. 1851. 



(;) A. M. Marshall. "On the mode of Ovipositiou of Amphioxus." Jour, of 

 A nut. and Pliys., Vol. x. 1876. 



